P0012 - Camshaft Position "A" - Timing Delay (Bank 1)

OBD-II DTC Malfunction Code – P0012 – Description

P0012 - Camshaft position "A" - time lag (bank 1).

P0012 is a generic OBD-II code indicating that the engine control module (ECM) has determined that the intake camshaft timing for bank 1 is later than what the ECM has indicated. This overly retarded timing condition may be during the camshaft timing advance or retard phase.

What does trouble code P0012 mean?

This Diagnostic Trouble Code (DTC) is a generic transmission code, which means it applies to OBD-II equipped vehicles including but not limited to Toyota, VW, Honda, Chevrolet, Hyundai, Audi, Acura, etc.

Code P0012 refers to the VVT ​​(Variable Valve Timing) or VCT (Variable Valve Timing) components and the vehicle's PCM (Powertrain Control Module) or ECM (Engine Control Module). VVT is a technology used in an engine to give it more power or efficiency at various points of operation.

It is made up of several different components, but the P0012 DTC is specifically related to camshaft (cam) timing. In this case, if the cam timing is excessively slow, the engine light will come on and a code will be set. Camshaft "A" is the intake, left or front camshaft. This code is bank 1 specific. Bank 1 is the side of the engine that contains the #1 cylinder.

Possible symptoms

Likely P0012 The DTC will result in one of the following events:

• hard start
• bad idling and / or
• dumping
• The ECM will turn on the check engine light if timing cannot be given to move.
• The engine will have difficulty starting due to the delayed timing position.
• Fuel consumption may decrease because the camshaft is not able to provide the maximum possible fuel consumption.
• Depending on the position of the camshaft, the engine may stall, oscillate, and run rougher than normal.
• The vehicle will fail the emissions test.

Other symptoms are also possible. Of course, when the DTCs are set, the malfunction indicator lamp (engine malfunction indicator lamp) comes on.

Note . Your drivetrain problems will vary depending on the position of the camshaft when the camshaft stopped moving.

Causes of the P0012 code

The P0012 DTC can be caused by one or more of the following:

• Incorrect valve timing.
• Wiring problems (harness / wiring) in the intake timing control solenoid valve system
• Constant oil flow into the VCT piston chamber
• Defective directional valve control solenoid (stuck open)
• Variable valve timing (VCT) oil valve (OCV) stuck open.
• The camshaft phaser is damaged and stuck in the retarded position.
• Problems with oil supply to the VCT piston and phase shifter.

Possible solutions

The main thing to check is to check the operation of the VCT solenoid. You are looking for a sticky or stuck VCt solenoid valve due to contamination. Refer to the specific vehicle repair manual to perform a component check on the VCT unit. Notes. Dealer technicians have advanced tools and the ability to follow detailed troubleshooting instructions, including the ability to test components with a diagnostic tool.

Other related DTCs: P0010 - P0011 - P0020 - P0021 - P0022

Common Mistakes When Diagnosing Code P0012?

Follow these simple tips to avoid mistakes:

• Always check for a fault before attempting to repair.
• Perform a thorough visual inspection for any wiring or component connection problems.
• Follow step-by-step instructions to prevent misdiagnosis.
• Do not replace any parts unless directed by spot or visual testing.

How serious is the P0012 code?

• The engine may run erratically and stall, oscillate, run rough, or be difficult to start.
• The engine may have excessive fuel consumption, carbon contamination of engine components, and various drive complaints depending on the faulty camshaft position.
• Driving the vehicle for extended periods of time with the reverse camshafts not engaged can cause other valvetrain or engine problems depending on the cause of the malfunction.

What repairs can fix code P0012?

• Clearing fault codes and performing a road test.
• Oil and filter change oil with a viscosity that matches the engine specifications.
• Repair or replace the wiring or connection of the camshaft oil control solenoid valve.
• Replacing the intake camshaft bank 1 camshaft oil valve.
• Check timing chain alignment for timing jumps and repair if necessary.

Additional comments to consider regarding code P0012

The camshaft phaser controls the timing advance and retard function via oil and oil pressure. The oil must have the correct viscosity for the camshaft adjustment system to work properly. If you use an oil that is too thick, it can cause this system to malfunction and cause error codes and engine performance problems. The wrong oil can cause this code and can cause multiple codes to appear along with it.

How To Fix Check Engine Light P0012 - Camshaft Position A - Timing Over Retarded (Bank 1)

Need more help with your p0012 code?

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NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.